Hi Natalie
Try -
P. Román, C. Guzmán-Miralles and A. Luque,
Acta Cryst. (1993). B49, 383-386 [ doi:10.1107/S0108768192007201 ]
"Estimate of a relationship between the number of atoms and the
volumes of the unit cells of organic compounds"
& references therein
On 5 May 2014, at 12:07, Natalie Tatum wrote:
> Hi all,
>
> I've had an interesting question from an undergradute student,
> asking if there's any specific reference for the "18Ĺ rule of thumb"
> in small molecule crystallography for dividing the volume of a unit
> cell by 18 for the approximate number of non-hydrogen atoms.
>
> I'm afraid my google-fu has failed me, but I was curious as to
> whether there is a reference associated with the practice of if it's
> just one of those handy little pieces of advice for crystal screening.
>
> Thanks,
>
> Natalie
>
> Natalie J. Tatum
> http://about.me/tatum.nj
> PhD Researcher
> Pohl Group
> Durham University
>
Harry
--
** note change of address **
Dr Harry Powell, MRC Laboratory of Molecular Biology, Francis Crick
Avenue, Cambridge Biomedical Campus, Cambridge, CB2 0QH
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